An Empirical Investigation of a Modified Gas Engine Heat Pump in Heating and Cooling Mode for the Residential Application

Document Type : Research Article


1 Department of Mechanical Engineering, Shahid Rajaee Teacher Training University, Tehran, I.R. IRAN

2 Energy Technological Research Division, Research Institute of Petroleum Industry (RIPI), Tehran, I.R. IRAN

3 Research and Technology of Fuel Consumption Optimization Company, Tehran, I.R. IRAN


Gas Engine Heat Pump (GEHP) is found as an effective machine among energy conversion systems. However, further improvement of GEHP performance is still indispensable. In the current study, to recycle efficiently the flue gases waste heat of GEHP unit, it is suggested to utilize a condensing heat exchanger. To assess the performance of the proposed GEHP, an equipped test room was designed.
The nominal capacity of the current GEHP is about 80 kW for heating and 71 kW for cooling. The experimental investigation was implemented for two common strategies, i.e. heating and cooling modes. The effect of outlet dry bulb temperature of 0 °C, 5 °C, 10 °C and 15 °C for heating, and 25 °C, 30 °C, 35 °C and 40 °C for cooling as well as water outlet temperature of 40 °C, 45 °C and 50 °C for heating and 8.5 °C, 11 °C, 14 °C for cooling on the performance of the GEHP is investigated. The 95% confidence interval has been considered in statistical analysis. In heating mode, results show that the efficiency of the condensing heat exchanger increases during the reduction of water out temperature and it leads to a Coefficient of Performance (COP) enhancement. Additionally, observation indicates that the decrement of the ambient air temperature from 5 to 0 ° C leads to the severe enhancement of fuel consumption of the gas engine. The performance indicators are re-evaluated using the non-condensing heat exchanger. It is concluded that the COP of GEHP with the condensing heat exchanger decreases by the steeper slope versus the reduction of the ambient dry bulb temperature compared to the non-condensing heat exchanger.


Main Subjects

[1] Bussmann W., "Editor Heating of the Dortmund–Wellinghofen Open Air Swimming Pool with a Gas Heat Pump (Two Years of Operational Experience)", Collection of Technical Papers—AIAA1978: ASME/ASCE/AHS Structures, Structural Dynamics & Materials Conference.
[2] Struck W., Willeitner E., Kok G., Generation of Heat with Diesel and Gas-Motor-Heat-Pumps, Klim Kaelte Ing., 6(7-8): 279-284 (1978).
[3] Morokoshi H., Inoue S., Fujio K., Okuda I., Suzuki S., Yamada H., Et Al. Gas-Engine-Driven Cooling/Heating Hot-Water Supply System, National Technical Report, 30(5):35-42 (1984).
[4] Hepbasli A., Erbay Z, Icier F., Colak N., Hancioglu E., A Review of Gas Engine Driven Heat Pumps (Gehps) for Residential and Industrial Applications, Renewable and Sustainable Energy Reviews, 13(1):85-99 (2009).
[5] Zhang R., Lu X., Li S., Lin W., Gu A., Analysis on the Heating Performance of a Gas Engine Driven Air to Water Heat Pump Based on a Steady-State Model, Energy Conversion and Management, 46(11-12): 1714-1730 (2005).
[6] Xu Z., Yang Z., Saving Energy in the Heat-Pump Air Conditioning System Driven by Gas Engine, Energy and Buildings, 41(2):206-211 (2009).
[7] Howell J.R., Peterson J.L., "Preliminary Performance Evaluation of a Hybrid Vapor-Compression/Liquid Desiccant Air Conditioning System", American Society of Mechanical Engineers, New York, NY; (1987).
[8] Sun Z., Wang R., Sun W., Energetic Efficiency of a Gas-Engine-Driven Cooling and Heating System, Applied Thermal Engineering, 24(5-6):941-947 (2004).
[9] Elgendy E., Schmidt J., Optimum Utilization of Recovered Heat of a Gas Engine Heat Pump Used
for Water Heating at Low Air Temperature, Energy and Buildings, 80:375-383 (2014).
[10] d'Accadia M.D., Sasso M., Sibilio S., Field Test of a Small-Size Gas Engine Driven Heat Pump
in an Office Application: First Results, International Journal of Ambient Energy, 16(4):183-191 (1995).
[11] Schmidt I.J., Fatouh I.M., Zhekov I.Z., "Analysis of Energy Efficiency of Gas Driven Heat Pumps".
[12] Patel J., Henderson Jr H.I., Collins M., Comparing Gas-Engine Cooling Systems, ASHRAE Journal, 40(3): 65-  (1998).
[13] Wu X., Yang Z., Liu H., Huan Z., Wang W., The Performance Of Mixture Refrigerant R134a/R152a in a Novel Gas Engine-Driven Heat Pump System, International Journal of Green Energy, 11(1):60-74 (2014).
[14] Zhang Q., Yang Z., Li N., Feng R., Gao Y., The Influence of Building Using Function on the Operating Characteristics of the Gas Engine Driven Heat Pump with Energy Storage System (Esgehps). Energy and Buildings, 167:136-151(2018).
[15] Shang S., Li X., Wu W., Wang B., Shi W., Energy-Saving Analysis of a Hybrid Power-Driven Heat Pump System, Applied Thermal Engineering, 123:1050-1059 (2017).
[16] Li Y-L., Zhang X-S., Cai L., A Novel Parallel-Type Hybrid-Power Gas Engine-Driven Heat Pump System, International Journal of Refrigeration, 30(7):1134-1142 (2007).
[17] Liu F., Dong F., Li Y., Jia L., Study on the Heating Performance and Optimal Intermediate Temperature of a Series Gas Engine Compression-Absorption Heat Pump System, Applied Thermal Engineering, 135: 34-40 (2018).
[18] Li S., Zhang W., Zhang R., Lv D., Huang Z., Cascade Fuzzy Control for Gas Engine Driven Heat Pump, Energy Conversion and Management, 46(11-12): 1757-1766 (2005).
[19] Zhao Y., Haibo Z., Zheng F., Modeling And Dynamic Control Simulation of Unitary Gas Engine Heat Pump, Energy Conversion and Management, 48(12): 3146-3153 (2007).
[20] Wang M., Yang Z., Su X., Zhang B., Wu X, Shi Y., Simulation And Experimental Research of Engine Rotary Speed for Gas Engine Heat Pump Based on Expert Control, Energy and Buildings, 64:95-102 (2013).
[21] Liu F-G., Tian Z-Y., Dong F-J., Yan C., Zhang R., Yan A-B., Experimental Study on the Performance of a Gas Engine Heat Pump for Heating and Domestic Hot Water, Energy and Buildings, 152:273-278 (2017).
[22] Hu B., Li C., Yin X., Cao F., Shu P., Thermal Modeling and Experimental Research of a Gas Engine-Driven Heat Pump In Variable Condition, Applied Thermal Engineering, 123: 1504-1513 (2017).
[23] Ma X., Cai L., Meng Q, Chen T., Zhang X., Dynamic Optimal Control and Economic analysis of a Coaxial Parallel-Type Hybrid Power Gas Engine-Driven Heat Pump, Applied Thermal Engineering, 131:607-620 (2018).
[24] Liu H., Zhou Q., Zhao H., Experimental Study on Cooling Performance and Energy Saving of Gas Engine-Driven Heat Pump System with Evaporative Condenser, Energy Conversion and Management,  23: 200-208 (2016;).
[25] CEN. European Standard EN 437. Test Gases – Test Pressures – Appliance Categories. Brussels (2003).
[26] Shamekh A.H., Khatibzadeh N., Shamekhi A., A Comprehensive Comparative Investigation of Compressed Natural Gas as an Alternative Fuel in a Bi-Fuel Spark Ignition Engine, Iranian Journal of Chemistry and Chemical Engineering (IJCCE), 27(1):73-83 (2008).
[27] Bidar B., Shahraki F., Energy and Exergo-Economic Assessments of Gas Turbine Based CHP Systems:
A Case Study of SPGC Utility Plant, Iranian Journal of Chemistry and Chemical Engineering (IJCCE), 37(5):209-223 (2018).
[28] Sohani A, Sayyaadi H, Balyani HH, Hoseinpoori S. A Novel Approach Using Predictive Models
for Performance Analysis of Desiccant Enhanced Evaporative Cooling Systems, Applied Thermal Engineering, 107: 227-252 (2016).
[29] Sohani A, Zabihigivi M, Moradi MH, Sayyaadi H, Balyani HH. A Comprehensive Performance Investigation of Cellulose Evaporative Cooling Pad Systems Using Predictive Approaches, Applied Thermal Engineering, 110: 1589-1608 (2017).
[30] Bouvenot J.-B., Latour B., Siroux M., Flament B., Stabat P., Marchio D., Dynamic Model Based on Experimental Investigations of a Wood Pellet Steam Engine Micro CHP For Building Energy Simulation, Applied Thermal Engineering, 73(1):1041-1054 (2014).
[31] Moffat R.J., Describing The Uncertainties in Experimental Results, Experimental Thermal and Fluid Science, 1(1): 3-17 (1988).
[32] Guide I. 98. "Guide to the Expression of Uncertainty in Measurement (GUM)", International Organization for Standardization, Genève. (1995).
[33] Sohani A., Sayyaadi H., Hoseinpoori S., Modeling and Multi-Objective Optimization of an M-Cycle Cross-Flow Indirect Evaporative Cooler Using the GMDH Type Neural Network, International Journal of Refrigeration, 69:186-204 (2016).
[34] Habibi M.R., Varmazyar M., Comprehensive Preliminary Experimental Performance Investigation of a Micro-CHP System by Using an Equipped Test Room, Applied Thermal Engineering, 134:428-436 (2018).